I've used Little Strike for quite some time, although I am currently using Purina Game Fish Chow and some small pellet / high protien Zigler's feed.
Purina in this area is so hard to find, and sometimes it is so expensive, it just isn't worth it. But, this time of year, Southern States is often sold out of Little Strike, so I have to look elsewhere.
Tractor Supply in this area is now selling a Cargill multi-sized pellet product that looks pretty good. I believe it is 38% protien, and its smallest size is quite small for the fingerlings. A friend bought some just recently, and I think I'm going to get a bag or two to try.